土壤有机质在土温()和积水()时,就以腐殖化过程为主。
A、高、少
B、低、少
C、高、多
D、低、多
参考答案:D
—Miss Li, what are we going to do next?
—Let's go out for doing sports. ________ sunny day! [ ]
A. What
B. What a
C. How
D. How a
PPD试验,皮内注射皮丘的直径为()
A.1~3mm
B.4~5mm
C.6~10mm
D.11~13mm
E.14~16mm